England won the fourth Test against Australia at Nottingham on Saturday by an innings and 78 runs and regained the Ashes with an insurmountable 3-1 lead in the five-match series. Starting the third day's play at Trent Bridge, at their overnight second innings score of 241 for seven, Australia were all out for 253. The visitors were trailing by 231 runs in the first innings.England's pace bowler Stuart Broad who took eight wickets in the Australian first innings was declared Man of the Match. In the second innings, Broad claimed one wicket.England won the Test with two days and more than two sessions to spare. The fifth and final test at The Oval, will begin on the 20th of this month. England have won five of the last seven Ashes series, and the last four at home. The scores: Australia – 60 and 253.England – 391 for nine declared.Ravaged by injuries and struggling like never before for form, the inspirational Australian captain Michael Clarke on Saturday announced he would retire from Test cricket after the fifth and final match of the on-going series. The fifth Test will begin from August 20 at the Oval and would be Clarke's 115th five-day game. The 34-year-old Clarke has already quit ODI and Twenty20 cricket. Clarke retired from ODIs after leading Australia to a fifth World Cup title this year. Never too keen on the Twenty20s, he quit the format back in 2010 after playing just 34 matches. Clarke's 114 Test appearances so far have yielded 8628 runs at an impressive average of 49.30. He scored 7981 runs in 245 ODIs at an average of 44.58.